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Idioms and Phrases with on the in, be

on the in, be

Have inside information, as in She was too new to the firm to be on the in for policy changes. [Colloquial; c. 1930] Also see in on; get an in with.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.